IBIC2014 - List of Keywords (dipole)

Paper	Title	Other Keywords	Page
MOCYB1	Non-Destructive Vertical Halo Monitor on the ESRF’s 6GeV Electron Beam	electron, scattering, emittance, detector	2
	K.B. Scheidt ESRF, Grenoble, France
	The population density along the electron’s beam vertical profile at far distance from the central core (i.e. the far-away tails or “halo”) is now quantitatively measurable by the use of bending magnet X-rays. An available beamport is equipped with two specifically adapted absorbers, an Aluminium UHV window, an X-ray light blocker, an X-ray imager, and a few motorizations. The simple and inexpensive set-up (much resembling that of an X-ray pinhole camera system for emittance measurements in Light Sources, but much shorter in length) allows the recording of images of the electron density profile over the 0.5 to 6mm distance range from the core. Results, obtained under various manipulations on the electron beam to vary either Touchek or residual Gas scattering and thereby the Halo levels, will be presented, to fully demonstrate that this Halo monitor is exploring those realms of the beam where other diagnostics can not reach .
	Slides MOCYB1 [2.830 MB]
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MOPF02	RHIC-Style IPMs in the Brookhaven AGS	electron, detector, injection, acceleration	39
	R. Connolly, W.C. Dawson, J.M. Fite, H. Huang, S.E. Jao, W. Meng, R.J. Michnoff, S. Tepikian BNL, Upton, Long Island, New York, USA
	Funding: Work supported by U.S. Department of Energy. Beam profiles in the two storage rings of the Relativistic Heavy-Ion Collider (RHIC) at Brookhaven National Lab (BNL) are measured with ionization profile monitors (IPMs). An IPM measures the distribution of electrons produced by beam ionization of background gas. These detectors have been developed at BNL in a program that began in 1996. The current detectors are a design from 2009. During the 2012 shutdown we refurbished the 2009 prototype detector and installed it in the Alternating-Gradient Synchrotron (AGS) for horizontal profiles. The commissioning tests were successful and in 2013 we built a new IPM for vertical profiles. In addition we placed coils on the backlegs of the permanent-magnet dipoles for beta-function measurements. This paper describes the AGS IPMs and shows data from the detector commissioning.
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MOPF10	A Compact In-Air X-Ray Detector for Vertical Beam Size Measurement at ALBA	photon, electron, detector, storage-ring	69
	A.A. Nosych, U. Iriso ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	An in-air x-ray detector (IXD) was developed for ALBA to study the residual x-rays after traversing the 35mm copper crotch absorbers. The device prototype is placed in-air after such absorber, mounted flush with the vacuum pipe. The remaining x-rays (above 120 keV) generate a visible footprint if they impinge upon a sensitive enough scintillator. We are using a Cerium doped PreLude 420 (LuYSiO:Ce) screen, and the image is observed with a simple optics system mounted on a commercial CCD camera. This measurement allows evaluating the vertical electron beam size with exposure times in the order of seconds. Similar instruments are used at ESRF and ANKA storage rings. This paper presents the results of the first measurements with IXD and describes its potential to be used as a full diagnostics tool for the 3 GeV storage ring of ALBA.
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TUPF06	Commissioning of the Electronics for HOM-based Beam Diagnostics at the 3.9 GHz Accelerating Module at FLASH	HOM, electronics, cavity, alignment	311
	N. Baboi, O. Hensler, L. Shi, T. Wamsat DESY, Hamburg, Germany N. Eddy, B.J. Fellenz Fermilab, Batavia, Illinois, USA P. Zhang CERN, Geneva, Switzerland
	Funding: The work is part of EuCARD-2, partly funded by the European Commission, GA 312453. Transverse Higher Order Modes (HOM) excited by electron beams in the 3.9 GHz accelerating cavities at FLASH may damage the beam quality. They can be reduced by extracting their energy through special couplers and by aligning the beam in the cavity. Electronics has been designed at FNAL for monitoring some of the potentially most damaging HOMs. This may be used for beam centering and therefore reducing the HOM effects. Moreover, the signals can be potentially calibrated into beam offset, so that they could be used as beam position monitors (HOM-BPM). The specifications of the monitors have been defined during an extensive study on the 4-cavity accelerating module installed at FLASH. Signals around 5.44 GHz have been chosen for higher precision measurements. However these signals propagate into the entire 1.2 m long module. Therefore in addition modes at about 9 GHz were selected for localized measurements in each cavity. The electronics has been recently installed at FLASH. The commissioning results will be presented in this paper. Instabilities previously observed in a test electronics as well as the HOM-BPMs in 1.3 GHz cavities will also be investigated. This electronics will also serve as a prototype for the electronics developed for the 3.9 GHz cavities at the European XFEL. L. Shi et al., this Conference **T. Wamsat et al., this Conference
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TUPF10	Stability Study of the Higher Order Mode Beam Position Monitors at the Accelerating Cavities at FLASH	HOM, cavity, electronics, polarization	327
	L. Shi, N. Baboi DESY, Hamburg, Germany R.M. Jones UMAN, Manchester, United Kingdom
	When electron beams traverse an accelerating structure, higher order modes (HOMs) are excited. They can be used for beam diagnostic purposes. Both 1.3 GHz and 3.9 GHz superconducting accelerating cavities at FLASH linac, DESY, are equipped with electronics for beam position monitoring, which are based on HOM signals from special couplers. These monitors provide the beam position without additional vacuum components and at low cost. Moreover, they can be used to align the beam in the cavities to reduce the HOM effects on the beam. However, the HOMBPM (Higher Order Mode based Beam Position Monitor) shows an instability problem over time. In this paper, we will present the status of studies on this issue. Several methods are utilized to calibrate the HOMBPMs. These methods include DLR (Direct Linear Regression), and SVD (Singular Value Decomposition). We found that SVD generally is more suitable for HOMBPM calibration. We focus on the HOMBPMs at 1.3 GHz cavities. Techniques developed here are applicable to 3.9 GHz modules. The work will pave the way for HOMBPMs of the E-XFEL (European X-Ray Free Electron Laser).
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TUPF21	NSLS2 Visible Synchrotron Light Monitor Diagnostic Beamline Commissioning	synchrotron, storage-ring, radiation, injection	369
	W.X. Cheng, B. Bacha, Y. Hu, O. Singh, H. Xu BNL, Upton, Long Island, New York, USA
	Visible Synchrotron Light Monitor (SLM) beamline has been designed and constructed at NSLS2 storage ring, to characterize the electron beam profile at various machine conditions. Due to carefully alignment, SLM beamline was able to see the first light even before beam circulating the ring. Besides a normal CCD camera to monitor the beam profile, streak camera and gated camera are used to measure the longitudinal and transverse profile to understand the beam dynamics. Measurement results from these cameras will be present in this paper.
	Poster TUPF21 [1.631 MB]
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TUPD01	Distinct Transverse Emittance Measurements of the PXIE LEBT	emittance, solenoid, ion, ion-source	393
	R.T.P. D'Arcy, B.M. Hanna, L.R. Prost, V.E. Scarpine, A.V. Shemyakin, J. Steimel Fermilab, Batavia, Illinois, USA
	Funding: This work was supported by the U.S. Department of Energy under contract No. DE-AC02-07CH11359. PXIE is the front-end test stand of the proposed PIP-II initiative i.e. the first step towards a CW-compatible, pulsed H⁻ superconducting RF linac upgrade to Fermilab’s injection complex. The test stand for this machine will be built step-wise; the Ion Source and Low-Energy Beam Transport (LEBT) are currently in place, with the RFQ and MEBT due for installation 2015. The initial LEBT configuration under investigation in this paper is comprised of a D-Pace Filament-driven H⁻ source and a single downstream solenoid, accompanied by a number of beam-diagnostic tools. The emittance studies expounded are performed via two methods: a position-angle phase-space sweep using an Allison-type emittance scanner; a solenoid corrector-induced transverse beam shift, impinging the bunch on an isolated, biased diaphragm. A detailed comparison of the two results is outlined.
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TUPD03	Terahertz and Optical Measurement Apparatus for the Fermilab ASTA Injector	radiation, laser, optics, experiment	403
	R.M. Thurman-Keup, A.H. Lumpkin, J.C.T. Thangaraj Fermilab, Batavia, Illinois, USA
	ASTA is a facility at Fermilab that, once completed, will consist of a photoinjector with two superconducting capture cavities, at least one superconducting ILC-style cryomodule, and a small ring for studying non-linear, integrable beam optics. This paper discusses the layout for the optical transport system that will provide THz radiation to a Martin-Puplett interferometer for bunch length measurements as well as optical radiation to an externally located streak camera, also for bunch length measurements. It will be able to accept radiation from two synchrotron radiation ports in the bunch compressor, a diffraction/transition radiation screen downstream of the compressor, and a transition radiation screen after the spectrometer magnet for measurements of energy-time correlations.
	Poster TUPD03 [3.202 MB]
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TUPD25	Cryogenic Beam Loss Monitors for the Superconducting Magnets of the LHC	detector, cryogenics, radiation, proton	471
	M.R. Bartosik, B. Dehning, M. Sapinski CERN, Geneva, Switzerland V. Eremin, E. Verbitskaya IOFFE, St. Petersburg, Russia E. Griesmayer CIVIDEC Instrumentation, Wien, Austria C. Kurfuerst EBG MedAustron, Wr. Neustadt, Austria
	Funding: This research project has been supported by a Marie Curie Early Initial Training Network Fellowship of the European Community’s Seventh Framework Programme (contract number: PITN-GA-2011-289485-OPAC). The Beam Loss Monitoring (BLM) detectors close to the interaction points (IP) of the Large Hadron Collider (LHC) are currently located outside the cryostat, far from the superconducting coils of the magnets. In addition to their sensitivity to lost beam particles, they also detect particles coming from the experimental collisions, which do not contribute significantly to the heat deposition in the superconducting coils. In the future, with beams of higher energy and brightness resulting in higher luminosity, distinguishing between these interaction products and dangerous quench-provoking beam losses from the primary proton beams will be challenging. The system can be optimised by locating beam loss monitors as close as possible to the superconducting coils, inside the cold mass of the magnets in superfluid helium at 1.9 K. The dose then measured by such Cryogenic Beam Loss Monitors (CryoBLMs) would more precisely correspond to the real dose deposited in the coil. The candidates under investigation for such detectors are based on silicon and diamond, several of which have now been installed inside the magnets in the LHC tunnel. This contribution will present the mechanical and electrical designs of these systems, as well as the results of their qualification testing.
	Poster TUPD25 [7.897 MB]
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Paper

Title

Other Keywords

Page

MOCYB1

Non-Destructive Vertical Halo Monitor on the ESRF’s 6GeV Electron Beam

electron, scattering, emittance, detector

2

K.B. Scheidt
ESRF, Grenoble, France

The population density along the electron’s beam vertical profile at far distance from the central core (i.e. the far-away tails or “halo”) is now quantitatively measurable by the use of bending magnet X-rays. An available beamport is equipped with two specifically adapted absorbers, an Aluminium UHV window, an X-ray light blocker, an X-ray imager, and a few motorizations. The simple and inexpensive set-up (much resembling that of an X-ray pinhole camera system for emittance measurements in Light Sources, but much shorter in length) allows the recording of images of the electron density profile over the 0.5 to 6mm distance range from the core. Results, obtained under various manipulations on the electron beam to vary either Touchek or residual Gas scattering and thereby the Halo levels, will be presented, to fully demonstrate that this Halo monitor is exploring those realms of the beam where other diagnostics can not reach .

Slides MOCYB1 [2.830 MB]

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MOPF02

RHIC-Style IPMs in the Brookhaven AGS

electron, detector, injection, acceleration

39

R. Connolly, W.C. Dawson, J.M. Fite, H. Huang, S.E. Jao, W. Meng, R.J. Michnoff, S. Tepikian
BNL, Upton, Long Island, New York, USA

Funding: Work supported by U.S. Department of Energy.
Beam profiles in the two storage rings of the Relativistic Heavy-Ion Collider (RHIC) at Brookhaven National Lab (BNL) are measured with ionization profile monitors (IPMs). An IPM measures the distribution of electrons produced by beam ionization of background gas. These detectors have been developed at BNL in a program that began in 1996. The current detectors are a design from 2009. During the 2012 shutdown we refurbished the 2009 prototype detector and installed it in the Alternating-Gradient Synchrotron (AGS) for horizontal profiles. The commissioning tests were successful and in 2013 we built a new IPM for vertical profiles. In addition we placed coils on the backlegs of the permanent-magnet dipoles for beta-function measurements. This paper describes the AGS IPMs and shows data from the detector commissioning.

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MOPF10

A Compact In-Air X-Ray Detector for Vertical Beam Size Measurement at ALBA

photon, electron, detector, storage-ring

69

A.A. Nosych, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

An in-air x-ray detector (IXD) was developed for ALBA to study the residual x-rays after traversing the 35mm copper crotch absorbers. The device prototype is placed in-air after such absorber, mounted flush with the vacuum pipe. The remaining x-rays (above 120 keV) generate a visible footprint if they impinge upon a sensitive enough scintillator. We are using a Cerium doped PreLude 420 (LuYSiO:Ce) screen, and the image is observed with a simple optics system mounted on a commercial CCD camera. This measurement allows evaluating the vertical electron beam size with exposure times in the order of seconds. Similar instruments are used at ESRF and ANKA storage rings. This paper presents the results of the first measurements with IXD and describes its potential to be used as a full diagnostics tool for the 3 GeV storage ring of ALBA.

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reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)

TUPF06

Commissioning of the Electronics for HOM-based Beam Diagnostics at the 3.9 GHz Accelerating Module at FLASH

HOM, electronics, cavity, alignment

311

N. Baboi, O. Hensler, L. Shi, T. Wamsat
DESY, Hamburg, Germany
N. Eddy, B.J. Fellenz
Fermilab, Batavia, Illinois, USA
P. Zhang
CERN, Geneva, Switzerland

Funding: The work is part of EuCARD-2, partly funded by the European Commission, GA 312453.
Transverse Higher Order Modes (HOM) excited by electron beams in the 3.9 GHz accelerating cavities at FLASH may damage the beam quality. They can be reduced by extracting their energy through special couplers and by aligning the beam in the cavity. Electronics has been designed at FNAL for monitoring some of the potentially most damaging HOMs. This may be used for beam centering and therefore reducing the HOM effects. Moreover, the signals can be potentially calibrated into beam offset, so that they could be used as beam position monitors (HOM-BPM). The specifications of the monitors have been defined during an extensive study on the 4-cavity accelerating module installed at FLASH. Signals around 5.44 GHz have been chosen for higher precision measurements. However these signals propagate into the entire 1.2 m long module. Therefore in addition modes at about 9 GHz were selected for localized measurements in each cavity. The electronics has been recently installed at FLASH. The commissioning results will be presented in this paper. Instabilities previously observed in a test electronics as well as the HOM-BPMs in 1.3 GHz cavities will also be investigated*. This electronics will also serve as a prototype for the electronics developed for the 3.9 GHz cavities at the European XFEL**.
*L. Shi et al., this Conference
**T. Wamsat et al., this Conference

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TUPF10

Stability Study of the Higher Order Mode Beam Position Monitors at the Accelerating Cavities at FLASH

HOM, cavity, electronics, polarization

327

L. Shi, N. Baboi
DESY, Hamburg, Germany
R.M. Jones
UMAN, Manchester, United Kingdom

When electron beams traverse an accelerating structure, higher order modes (HOMs) are excited. They can be used for beam diagnostic purposes. Both 1.3 GHz and 3.9 GHz superconducting accelerating cavities at FLASH linac, DESY, are equipped with electronics for beam position monitoring, which are based on HOM signals from special couplers. These monitors provide the beam position without additional vacuum components and at low cost. Moreover, they can be used to align the beam in the cavities to reduce the HOM effects on the beam. However, the HOMBPM (Higher Order Mode based Beam Position Monitor) shows an instability problem over time. In this paper, we will present the status of studies on this issue. Several methods are utilized to calibrate the HOMBPMs. These methods include DLR (Direct Linear Regression), and SVD (Singular Value Decomposition). We found that SVD generally is more suitable for HOMBPM calibration. We focus on the HOMBPMs at 1.3 GHz cavities. Techniques developed here are applicable to 3.9 GHz modules. The work will pave the way for HOMBPMs of the E-XFEL (European X-Ray Free Electron Laser).

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TUPF21

NSLS2 Visible Synchrotron Light Monitor Diagnostic Beamline Commissioning

synchrotron, storage-ring, radiation, injection

369

W.X. Cheng, B. Bacha, Y. Hu, O. Singh, H. Xu
BNL, Upton, Long Island, New York, USA

Visible Synchrotron Light Monitor (SLM) beamline has been designed and constructed at NSLS2 storage ring, to characterize the electron beam profile at various machine conditions. Due to carefully alignment, SLM beamline was able to see the first light even before beam circulating the ring. Besides a normal CCD camera to monitor the beam profile, streak camera and gated camera are used to measure the longitudinal and transverse profile to understand the beam dynamics. Measurement results from these cameras will be present in this paper.

Poster TUPF21 [1.631 MB]

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TUPD01

Distinct Transverse Emittance Measurements of the PXIE LEBT

emittance, solenoid, ion, ion-source

393

R.T.P. D'Arcy, B.M. Hanna, L.R. Prost, V.E. Scarpine, A.V. Shemyakin, J. Steimel
Fermilab, Batavia, Illinois, USA

Funding: This work was supported by the U.S. Department of Energy under contract No. DE-AC02-07CH11359.
PXIE is the front-end test stand of the proposed PIP-II initiative i.e. the first step towards a CW-compatible, pulsed H⁻ superconducting RF linac upgrade to Fermilab’s injection complex. The test stand for this machine will be built step-wise; the Ion Source and Low-Energy Beam Transport (LEBT) are currently in place, with the RFQ and MEBT due for installation 2015. The initial LEBT configuration under investigation in this paper is comprised of a D-Pace Filament-driven H⁻ source and a single downstream solenoid, accompanied by a number of beam-diagnostic tools. The emittance studies expounded are performed via two methods: a position-angle phase-space sweep using an Allison-type emittance scanner; a solenoid corrector-induced transverse beam shift, impinging the bunch on an isolated, biased diaphragm. A detailed comparison of the two results is outlined.

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TUPD03

Terahertz and Optical Measurement Apparatus for the Fermilab ASTA Injector

radiation, laser, optics, experiment

403

R.M. Thurman-Keup, A.H. Lumpkin, J.C.T. Thangaraj
Fermilab, Batavia, Illinois, USA

ASTA is a facility at Fermilab that, once completed, will consist of a photoinjector with two superconducting capture cavities, at least one superconducting ILC-style cryomodule, and a small ring for studying non-linear, integrable beam optics. This paper discusses the layout for the optical transport system that will provide THz radiation to a Martin-Puplett interferometer for bunch length measurements as well as optical radiation to an externally located streak camera, also for bunch length measurements. It will be able to accept radiation from two synchrotron radiation ports in the bunch compressor, a diffraction/transition radiation screen downstream of the compressor, and a transition radiation screen after the spectrometer magnet for measurements of energy-time correlations.

Poster TUPD03 [3.202 MB]

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TUPD25

Cryogenic Beam Loss Monitors for the Superconducting Magnets of the LHC

detector, cryogenics, radiation, proton

471

M.R. Bartosik, B. Dehning, M. Sapinski
CERN, Geneva, Switzerland
V. Eremin, E. Verbitskaya
IOFFE, St. Petersburg, Russia
E. Griesmayer
CIVIDEC Instrumentation, Wien, Austria
C. Kurfuerst
EBG MedAustron, Wr. Neustadt, Austria

Funding: This research project has been supported by a Marie Curie Early Initial Training Network Fellowship of the European Community’s Seventh Framework Programme (contract number: PITN-GA-2011-289485-OPAC).
The Beam Loss Monitoring (BLM) detectors close to the interaction points (IP) of the Large Hadron Collider (LHC) are currently located outside the cryostat, far from the superconducting coils of the magnets. In addition to their sensitivity to lost beam particles, they also detect particles coming from the experimental collisions, which do not contribute significantly to the heat deposition in the superconducting coils. In the future, with beams of higher energy and brightness resulting in higher luminosity, distinguishing between these interaction products and dangerous quench-provoking beam losses from the primary proton beams will be challenging. The system can be optimised by locating beam loss monitors as close as possible to the superconducting coils, inside the cold mass of the magnets in superfluid helium at 1.9 K. The dose then measured by such Cryogenic Beam Loss Monitors (CryoBLMs) would more precisely correspond to the real dose deposited in the coil. The candidates under investigation for such detectors are based on silicon and diamond, several of which have now been installed inside the magnets in the LHC tunnel. This contribution will present the mechanical and electrical designs of these systems, as well as the results of their qualification testing.

Poster TUPD25 [7.897 MB]

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